"I don't like that we're talking about full-figured women because it's glamorizing them because your waist should be smaller than 35 (inches), Tiegs said. "That's what Dr. Oz said, and I'm sticking to it.

"I don't think it's healthy in the long run."

She might have considered picking another health authority to quote. A 2014 study by real-world doctors found that only one-third of claims made on "The Dr. Oz Show" can be backed by medical evidence.

Graham, 28, who has overcome doubts by agents who viewed her body as too voluptuous for modeling, was thrilled to be picked by Sports Illustrated for the swimsuit issue.

And despite what Tiegs may think, she considers herself healthy.

"The moment I realized I had to be healthy and happy in who I was, that's when my career took off," she told E! News.

She hopes her success will encourage young girls who have struggled with body-image issues.